Shock isolator



March l, 1955 K. w. JOHNSON SHOCK ISOLATOR Filed Oct. 20, 1953 TE- L f@HA/60M 121K ATTORNEY United States Patent 4O SHOCK ISOLAI'OR Kenneth W.Johnson, Dayton, Ohio Application October 20, 1953, Serial No. 387,239

7 Claims. (Cl. 267-1) The present invention `relates to a shock isolatorand it consists in the combinations, constructions and arrangements ofparts herein described and claimed.

Generally there is provided'a rectangular base plate having upwardlyextending end walls each of which is provided with an inturned ange. Arubber buler member is mounted lbetween the ange and the1base, in eachcase and positioned adjacent its associated end wall. The anges areinterconnected centrally with a horizontally extending strap. A pair ofdownwardly and outwardly extending plates are hinged together at theirupper ends and are interconnected with a pair of tension springs. Thelower edges of the plates bear against the base which latter is providedwith novel damping elements which are'preferably punched threfrom. Thestrap which interconnects the flanges extends through suitable openingin the plates whereby to retain the device as a single unit and means isprovided for attaching such units either singly or in multiples upon theinner wall of, for example, a packing case or the like with the hingedends of the plates extending toward and in contact with the load carriedby such case. The device is such that it utilizes spring means, elasticmeans and frictional means in combination to resist shock.

lt is accordingly an object of the invention to provide an isolatorhaving combined frictional, spring and/or elastic means for theresisting of shocks.

Another object of the invention is to provide a device of the characterset forth which may be fabricated of a variety of materials.

Another object of the invention is to provide a device of the characterset forth which is simple in construction, inexpensive to manufactureand yet eiective and eflicient 1n use.

Another object of the invention is to provide, in a device of thecharacter set forth, a pair of novel shock resisting plates forming apart of the invention.

Still another object of the'invention is to provide, in a device of thecharacter set forth, novel frictionally operated shock resistingelements forming a part of the invention.

A further object of the invention is to provide, in a device of thecharacter set forth, novel elastic shock resisting elements forming apart of the invention.

Other and further objects of the invention will become apparent from areading of the following specification taken in conjunction with thedrawing, in which:

Figure l is a plan View of a packing casel having a plurality of thedevices of the present invention mounted therein in operative position,

Figure 2 is a plan view of an embodiment of the present invention,

Figure 3 is a sectional view taken along line 33 of Figure 2 and showingthe ,device in its normal position.

Figure 4 is a sectional view taken along line 4-4 of Figure 2,

Figure 5 is a view similar to Figure 3 but showing the same incompressed condition,

Figure 6 is a view similar to Figures 3 and 5 but showing the device ina position it might assume when rebounding from a shock applied thereto,

Figure 7 is a sectional view taken along line 7-7 of Figure 2, and

Figure 8 is a somewhat enlarged fragmentary sectional view taken alongline 8--8 of Figure 2.

Referring more particularly to the drawing, there is shown therein adevice of the character set forth having .a generally rectangular baseplate 10 having a pair of in- A 2,703,233 Patented Mar. l, 1955 icetegrally formed upstanding end walls 11 each provided with an integrallyformed inwardly extending horizontal flange 12. The flanges 12 arecentrally interconnected by means of a guide strap 13 which may beformed of two parts and centrally welded, as indicated at 14.

A buffer strip 15, preferably formed of rubber or like material, `isfrictionally mounted adjacent the inner face of each of the end walls l1and held in position by the adjoining portion of the base 10 and itsassociated ange 12, it being apparent that each of the buffer members 15extends transversely with respect to the base 10.

A pair of downwardly and outwardly extending shock plates 16 arehingedly interconnected at their upper ends, as indicated at 17 and thefree lower ends of the plates 16 bear against the upper face of the baseplate 10. The plates 16 have their lower edges extending transverselywith respect to the base plate 10 and in parallel relation to thebuffers 15. The plates 16 are each centrally provided with alongitudinal slot 18 which slots encompass the guide strap 13, and apair of springs 19 interconnect the plates 16 upon either side of theslots 18. If desired, other elastic means, as for example, rubber may beused for `springs 19.

The base plate is provided with a pair of inwardly and upwardly directedfrictional dampers 20 each of which is adapted to engage the lower edgeof one of the plates 16 and is also provided with a pair of upwardly andoutwardly `directed dampers 21 each of which is likewise adapted toengage the free edge of one of the plates 16. The plate 10 may befastened, for example, to the inner face of a box wall 22 by means ofscrews 23 or the like. A load 24 is indicated within the packing caseillustrated in Figure l.

ln operation, it will be apparent that the device of the presentinvention may be utilized singly or, as shown, for example, in Figure l,in multiples. lt will be apparent that whether used singly or inmultiples, that in each case the base plate 10 will be affixed to, forexample, the inner wall of a packing case or the like while the hinge 17will bear against the load 24 to be protected by the device. Referringnow to Figures 3, 5 and 6, it will be apparent that the normal positionof the device will be as shown in Figure 3 wherein the lower edges ofthe plates 16 will lie adjacent the lower ends of the dampers 20 and 21.When, however, a downward shock is imparted to the device it will beseen that such shock is first absorbed or partially absorbed by thesprings 19 and the ever increasing frictional engagement of the loweredges of the plates 16 with the dampers 21 and that finally the freeends of the plates 16 will come into contact with the buffers 15 and theremaining portions of the shock imparted to the device will be absorbedby such buffers. lt will also be apparent that if the shock imparted tothe device be great enough to cause a rebound of the work piece 24 thatupon the outward movement of the plates 16, the lower ends thereof willbear against the dampers 20 in ever increasing frictional engagementtherewith. lt will also be apparent that the guide strap 13 will act tomaintain the plates 16 and their attached springs 19 in unitaryconnection with the remainder of the device.

While but one form of the invention has been shown and described herein,it will be readily apparent to those skilled in the art that many minormodifications may be made without departing from the spirit of theinvention or the scope of the appended claims.

What is claimed is:

l. A device of the character described comprising a at base plate, apair of shock plates hinged together at their outer ends and havingtheir free ends in contact with said base plate, said shock platesextending transversely with respect to said base plate, spring meansinterconnecting said shock plates, a butter strip of elastic materialmounted transversely at each end of said base plate and adapted toresist outward movement of the free ends of said shock plates, and meansfor limiting preparation of said shock plates from said base plate.

2. A device of the character described comprising a at base plate, apair of shock plates hinged together at their outer ends and havingtheir free ends in contact with said base plate, said shock platesextending transversely with respect to said base plate, spring meansinterconnecting 3 said shock plates, a buffer strip of elastic materialmounted transversely at each end of said base plate and adapted toresist outward movement of the free ends of said shock plates,frictional means for resisting movement of said shock plates toward andaway from said'buffer strips, and means for limiting separation of saidshock plates from said base plate.

3. A device of the character described comprising a at base plate, apair of shock plates hinged together at their outer ends and havingtheir free ends in contact with said base plate, said shock platesextending transversely with respect to said base plate, spring meansinterconnecting said shock plates, a buffer strip of elastic materialmounted transversely at each end of said base plate and adapted toresist outward movement of the free ends of said shock plates, and meansfor limiting separation of said shock plates from said base plate, saidlimiting means comprising a centrally disposed guide strip affixed tosaid base plate in spaced relation thereto, and a centrally disposedopening in each of said shock plates for receiving said striptherethrough.

4. A device of the character described comprising a fiat base plate, apair of shock plates hinged together at their outer ends and havingtheir free ends in contact with said base plate, said shock platesextending transversely with respect to said base plate, spring meansinterconnecting said shock plates, a buffer strip of elastic materialmounted transversely at each end of said base plate and adapted toresist outward movement of the free ends of said shock plates,frictional means for resisting movement of said shock plates toward andaway from said buier strips, and means for limiting separation of saidshock plates from said base plate, said limiting means comprising acentrally disposed guide strip aXed to said base plate in spacedrelation thereto, and a centrally disposed opening in each of said shockplates for receiving said strip therethrough.

5. A device as dened in claim 1 wherein said base plate is provided witha pair of integrally formed transverse end walls, wherein an inwardlydirected ange is integrally formed with the free end of each end wall,and wherein said buffer strips are each frictionally mounted between itsassociated ange, end wall and adjacent portion of said base plate.

6. A device as defined in claim 2 wherein said frictional meanscomprises pairs of upwardly and inwardly directed and upwardly andoutwardly directed dampers struck from and integrally connected withsaid base plate, each member of each of said pairs being positionedadjacent an end of said base plate and said shock plates having theirfree ends normally in contact with said base plate at the lowermostportions of said dampers.

7. A device as defined in claim 3 wherein said spring means comprises apair of tension springs each disposed upon an opposite side of saidguide strip.

References Cited in the le of this patent UNITED STATES PATENTS

